Transaxle oil study report

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Old 04 Jun 2011, 03:28 pm   #1 (permalink)
bwilson4web
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Default Transaxle oil study report

I've been conducting a Prius transaxle oil study over the past six
years and just posted a summary report:

http://www.myhybridcar.com/forums/ga....html#post3896

"Early transaxle oil change - a new car should have the transaxle oil
changed early with the first engine oil change. This will flush the
early wear material and loss sealant bits.

NHW11 - should use Type T-IV over Type WS as the wear patterns suggest
the lower viscosity losses may be more than offset by higher wear,
friction losses. NEVER USE AMSOIL ATF DUE TO EXCESSIVE COPPER WEAR. Do
an early change and then every 30k miles.

NHW20 transaxle oil should be changed early, at 60k miles, and then
90k miles thereafter.

Use of a transaxle heater to bring the oil closer to operating
temperature should receive equal weight to an engine block heater in
colder weather."

Bob Wilson
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Old 08 Jun 2011, 10:55 am   #2 (permalink)
liu
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Default Re: Transaxle oil study report

I have a 1994 Camry that never had the transaxle oil changed and it's
still working. Is there a concern in the future?
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Old 08 Jun 2011, 11:16 am   #3 (permalink)
News
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Default Re: Transaxle oil study report

On 6/8/2011 10:55 AM, liu wrote:
> I have a 1994 Camry that never had the transaxle oil changed and it's
> still working. Is there a concern in the future?



Undoubtedly already a concern, at your dealer or service shop...
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Old 08 Jun 2011, 11:25 pm   #4 (permalink)
bwilson4web
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Default Re: Transaxle oil study report

On Jun 8, 9:55*am, liu <spamfree...@yahoo.com> wrote:
> I have a 1994 Camry that never had the transaxle oil changed and it's
> still working.


I had a 1991 Camry before an accident led to it having the title
pulled by the insurance company. It was a solid, 32 MPG car and I
would still be driving it but for the accident. But once I lost it,
the replacement was our 2003 Prius.

> . . . Is there a concern in the future?


Our 2003 Prius gets 52 MPG, dawn-to-dawn and like the famous heroic
pig with the wooden leg, You don't want eat him up at one time:
http://www.crosswalk.com/culture/hum...g-1351623.html

We have to use our 2003 Prius but we don't want to use it up too
early. <GRINS>

Bob Wilson

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Old 11 Jun 2011, 09:04 pm   #5 (permalink)
Leftie
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Default Re: Transaxle oil study report

liu wrote:
> I have a 1994 Camry that never had the transaxle oil changed and it's
> still working. Is there a concern in the future?


If you had the transmission fluid changed, there is some exchange
between it and the transaxle/differential, through a baffle.
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Old 15 Jun 2011, 10:18 am   #6 (permalink)
liu
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Default Re: Transaxle oil study report

On Jun 11, 9:04*pm, Leftie <N...@Thanks.net> wrote:
> liu wrote:
> > I have a 1994 Camry that never had the transaxle oil changed and it's
> > still working. Is there a concern in the future?

>
> * * If you had the transmission fluid changed, there is some exchange
> between it and the transaxle/differential, through a baffle.


Thank you all for the info. I will get at least transmission fluid
replaced. I assume it's easier to change that than transaxle.
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Old 20 Jun 2011, 08:44 am   #7 (permalink)
Leftie
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Default Re: Transaxle oil study report

liu wrote:
> On Jun 11, 9:04 pm, Leftie <N...@Thanks.net> wrote:
>> liu wrote:
>>> I have a 1994 Camry that never had the transaxle oil changed and it's
>>> still working. Is there a concern in the future?

>> If you had the transmission fluid changed, there is some exchange
>> between it and the transaxle/differential, through a baffle.

>
> Thank you all for the info. I will get at least transmission fluid
> replaced. I assume it's easier to change that than transaxle.



If this is the first time you've had it changed, *do not* allow them
to do a "power flush" or "fluid exchange." These will force crud into
places it should not go, and can cause failure of the transmission.
Instead, have then do a 'spill and fill' fluid change, which is just a
regular oil pan drain and fill change, but have them remove the pan and
replace the fluid filter screen and wipe the pan clean. Then have just
the fluid change (not the filter replacement) done again every thousand
or two miles until it's been done about three times. This is the safest
way to replace ancient transmission fluid in old automatic
transmissions. The transmission used in your Camry is tough, but the
brake bands have a soft compound that gets into the fluid, so regular
fluid changes really extend the life.
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